This code is selected in the numerous jQuery checkbox function code, the code used in my project, here to share with you.

JQuery code:

        $(function(){
            $("#checkedAll").click(function(){
                $('[name=items]:checkbox').attr('checked',true);
            });
            $("#checkedNo").click(function(){
                $('[name=items]:checkbox').attr('checked',false);
            });
            $("#checkedRev").click(function(){
                $('[name=items]:checkbox').each(function(){
                    //$(this).attr('checked',!$(this).attr('checked'));
                    this.checked = !this.checked;
                });
            });
            $("#send").click(function(){
               var str = " What you selected is: rn";
               $('[name=items]:checkbox:checked').each(function(){
                   str += $(this).val()+"rn";
               });
                alert(str);
            });
        }); 

HTML code:

     What's your favorite sport? <br>
    <input type="checkbox" name="items" value=" football "/> football
    <input type="checkbox" name="items" value=" basketball "/> basketball
    <input type="checkbox" name="items" value=" badminton "/> badminton
    <input type="checkbox" name="items" value=" Table tennis "/> Table tennis <br>
    <input type="button" id="checkedAll" value=" all   choose "/>
    <input type="button" id="checkedNo" value=" All don't choose "/>
    <input type="button" id="checkedRev" value=" the   choose "/>
    <input type="button" id="send" value=" mention   Hand in "/>